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Assignment / Instructions: Students will be divided into 5 groups. Each group will be assigned so many grams of salt, a color, and specific temperature of water for mixing in the 100 ml beakers. (Note: The water temperature should be approx. 50 degrees in the half filled fish tank.)

Each group will be creating a table to record the following data: Weight of the beaker. Weight of the beaker and water at the assigned temperature in degrees Fahrenheit before adding the salt. Weight of the beaker and water weight at assigned temperature in degrees Fahrenheit after adding the salt.

Graphing: Have each students create three graphs using the recorded data. The students will use the computer to graphically illustrate the relationship of water density per salt concentration, the second graph illustrating water density per change in temperature, and the third graph should show the relationship of water density per mixture of salt concentration & water temperature.

Questions for the students to answer:

How does salinity in water change water density?

Which has a greater effect on water density temperature or salinity?

Based on the observations, where would you suspect the ocean water to have higher concentrations of salinity?

In those regions of the ocean that you would suspect higher concentrations of salinity, how will water temperature change the ocean currents… will there be an upwelling or downward flow pattern?

Internet Search and Conclusions: Have each student search the topic “ocean currents” to find examples of what they observed in the classroom. For the conclusions, have the student write a one page summary incorporating the information they found on the web to provide examples these ocean currents found in different parts of the world and explain why these current may or may not be beneficial to people who live in these areas of the world.

Comments: Collectively, the class will be working together exchanging the data they have collected while doing the experiment.